People are generally aware of the most common causes of hallucinations, like schizophrenia and a really high fever. But lesser known are the more rare causes; here are six you probably haven't heard about.

For something so intrinsically a part of us, it seems there’s plenty we’re in the dark about when it comes to our blood type. Indeed, according to various surveys, anywhere from 35 to 50 percent of people in the Western world just plain don’t know what their type even is.

That’s why we here at Medical Daily have decided to pull back the curtain and lay down some interesting factoids about blood types and their continuing, if sometimes overexaggerated, importance to our lasting health. Click on the slideshow above to check them out.